First attempt to create coding guidelines
-----------------------------------------

1) Generally formatting style should follow Mozilla JavaScript Style Guide
   (https://developer.mozilla.org/en/JavaScript_style_guide).

2) Generally I would like to follow formatting and other advice by jslint
   (http://www.jslint.com/). However, I don't want to be bound by sometimes
   eccentric opinions of Douglas Crockford, more I care about checking
   for missing semicolons, bad spacing, etc. However, in order to make
   jslint at least partially work, I need to be quite conservative in
   using any non-standard constructs (Douglas strictly refused to add
   any non-standard pieces of syntax, particularly let, when I emailed
   him about it).
   It follows that let and other non-ECMAScript construcsts shouldn't be used
   or at least sparingly and only in the time of dire need.

3) Object literals should be used for pure data objects only. Instead of

    var Foo.prototype = {
        bar: function bar () {
            console.log("We are in bar! Yuchuuu!!!");
        },
        baz: function baz () {
            console.log("We are in baz :(");
        }
    };

    write rather two functions separately as in

    Foo.prototype.bar = function bar () {
        console.log("We are in bar! Yay!!!");
    };

    Foo.prototype.baz = function baz () {
        console.log("We are in baz :( Shooot.");
    };

    The latter is in my opinion more readable and works better in editors
    I use (gedit, scribes, and eclipse).

4) Use plain JavaScript only. This is not multi-platform (meaning mult-browser)
   script so no JavaScript libraries (e.g., jQuery, Dojo, etc.) should be
   used.
   On the other hand, we don't have to bound ourselves to compatibility
   with anything else than platforms Add-on SDK runs on. So, instead of
   hopeless non-standard constructs of jQuery, element.querySelector (with
   standard CSS3 selector, which is NOT the same as what's used in
   jQuery; see http://www.w3.org/TR/2009/PR-css3-selectors-20091215/) and other
   advanced JavaScript functions can be used.

Any other items could be added after discussion and when a need to decide
some pressing issue happens.